2a830a45ff
Device counting could be controlled by the level or the edges of a trigger. in_count0_enable_mode attibute allow to set the control mode. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
3.1 KiB
What: /sys/bus/iio/devices/triggerX/master_mode_available KernelVersion: 4.11 Contact: benjamin.gaignard@st.com Description: Reading returns the list possible master modes which are: - "reset" : The UG bit from the TIMx_EGR register is used as trigger output (TRGO). - "enable" : The Counter Enable signal CNT_EN is used as trigger output. - "update" : The update event is selected as trigger output. For instance a master timer can then be used as a prescaler for a slave timer. - "compare_pulse" : The trigger output send a positive pulse when the CC1IF flag is to be set. - "OC1REF" : OC1REF signal is used as trigger output. - "OC2REF" : OC2REF signal is used as trigger output. - "OC3REF" : OC3REF signal is used as trigger output. - "OC4REF" : OC4REF signal is used as trigger output.
What: /sys/bus/iio/devices/triggerX/master_mode KernelVersion: 4.11 Contact: benjamin.gaignard@st.com Description: Reading returns the current master modes. Writing set the master mode
What: /sys/bus/iio/devices/triggerX/sampling_frequency KernelVersion: 4.11 Contact: benjamin.gaignard@st.com Description: Reading returns the current sampling frequency. Writing an value different of 0 set and start sampling. Writing 0 stop sampling.
What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset KernelVersion: 4.12 Contact: benjamin.gaignard@st.com Description: Reading returns the current preset value. Writing sets the preset value. When counting up the counter starts from 0 and fires an event when reach preset value. When counting down the counter start from preset value and fire event when reach 0.
What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available KernelVersion: 4.12 Contact: benjamin.gaignard@st.com Description: Reading returns the list possible quadrature modes.
What: /sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode KernelVersion: 4.12 Contact: benjamin.gaignard@st.com Description: Configure the device counter quadrature modes: channel_A: Encoder A input servers as the count input and B as the UP/DOWN direction control input.
channel_B:
Encoder B input serves as the count input and A as
the UP/DOWN direction control input.
quadrature:
Encoder A and B inputs are mixed to get direction
and count with a scale of 0.25.
What: /sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available KernelVersion: 4.12 Contact: benjamin.gaignard@st.com Description: Reading returns the list possible enable modes.
What: /sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode KernelVersion: 4.12 Contact: benjamin.gaignard@st.com Description: Configure the device counter enable modes, in all case counting direction is set by in_count0_count_direction attribute and the counter is clocked by the internal clock. always: Counter is always ON.
gated:
Counting is enabled when connected trigger signal
level is high else counting is disabled.
triggered:
Counting is enabled on rising edge of the connected
trigger, and remains enabled for the duration of this
selected mode.